{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "The second step is rate - limiting and is facilitated by the presence of the high - spin Mn ( 2 + ) ion that functions as a Lewis acid and stabilizes the leaving oxyanion through direct coordination ."}
{"Chemical": ["Mn ( 2 + )", "Lewis acid"]}